Qbus modbus interface Basic

• Functional Description

  Module to integrate HVAC devices with a Modbus RTU or Modbus TCP/IP interface into a Qbus installation. The QMI/Basic acts as a Modbus master and allows up to 6 slave devices to be connected with a total of 42 registers.

  Through System Manager III, the appropriate Modbus parameters and registers can be easily selected and configured per device. Default settings for data format, word order, and signed/unsigned are automatically filled in, enabling fast and error-free integration. The communication settings (RTU or TCP/IP) are configurable depending on the application. For TCP/IP connection, each slave can be individually assigned an IP address and port, including checking for duplicate IP addresses within the installation.

  Additional Modbus commands are regularly integrated into the Qbus Modbus Interface Module upon customers' request. Each QMI/Basic module has a unique serial number that always allows for programming and identification. All configured data is internally stored in permanent memory. Firmware updates occur via the Qbus bus.

• Technical specifications

  General Specifications 

  • Power Supply: Qbus bus
  • Ambient Temperature: Operating Temperature: 10°C to 50°C Storage Temperature: -10°C to 60°C
  • Maximum Humidity: 93%, no condensation
  • Bus Power Supply:
    • no-load: 45 mA at nominal 18 V
    • RTU loaded: 50mA at nominal 18V
    • TCP loaded: 50mA at nominal 18V
    • RTU & TCP loaded: 80mA at nominal 18V
  • Max. Installation Height: 2,000 meters. 

  QMI/Basic Connections

  The QMI/Basic serves as a Modbus master and supports both Modbus RTU (RS485) and Modbus TCP/IP

  • A maximum of 42 Modbus registers can be configured per module.
  • A maximum of 6 Modbus slave devices can be linked per module.
  • The number of required registers per external device (typically 5–8) determines the maximum number of effectively controllable devices within the limit of 42 registers.

  RS485 (RTU)

  • Maximum distance between QMI/Basic and external device: 1000 m
  • Cabling possible in bus (line) or star topology, according to RS485 guidelines
  • Configurable baud rate, parity, and stop bits via System Manager III

  Ethernet (TCP/IP)

  • 10/100 Mbps
  • DHCP for QMI, static IP for slave device
  • Individual IP configuration per slave device
  • Check for duplicate IP addresses within the same module
  • Standard Modbus TCP port 502 (adjustable)

   Physical Specifications: 

  • Housing: plastic, self-extinguishing according to UL94-V0
  • Protection Rating: IP20 according to EN60529
  • Installation: quick installation on DIN rail, width 2 modules
  • Dimensions (H x W x D): 62 mm x 90 mm x 36 mm
  • Weight: approximately 0.072 kg

  Compliance: 

  • CE compliance
  • Bus: 18 VDC low voltage
  • Non-toxic, compliant with WEEE/RoHS
  • Compliant with EN 60730-1:2000 +A11:2002
• Sizing
• Explanation of symbols

  Equipment where protection against the risk of electric contact is not only based on basic insulation but also on additional protection such as double insulation or reinforced insulation. There is no possibility for grounding.

  Before connecting the device, it is mandatory to read the manual of the respective product. ISO7000-0434

  Power supply connection (230V) to the power supply connector. IEC 60417-5036

  CE conformity. All declarations of conformity are available upon request.

• Warranty Statement

  2 years from the date of delivery. The warranty becomes void if the module has been opened! The warranty period is extended by 2 years if it was installed by a certified Qbus installer.

  In case of defects, Qbus support should be contacted by a certified installer. After registration with Qbus support, the defective module can be sent, unsealed and with a description of the defect, to our Qbus support.

  QBUS N.V. Joseph Cardijnstraat 19, 9420 Erpe-Mere, Belgium

  T +32 53 60 72 10 - F +32 53 60 72 19

  Email: [email protected]

General

• Safety Regulations

  Read the full manual before installing and activating the module. 

  WARNING

  • Assembly, commissioning, and maintenance of the devices must be performed by a certified electrician in accordance with applicable legal requirements.
  • This device is suitable only for DIN-rail mounting according to EN50022. It must be installed in a fireproof distribution board with ventilation openings.
  • Do not open the device. The warranty is void if the module is opened.
  • Risk of electric shock from contact with live parts.

Install and cable

• Installation

  Click the module onto a DIN-rail DIN EN50022.

• Power Supply

  The QMI/Basic is powered by the bus

• Modbus cabling

  RS485

  The wiring between the Modbus port on the external device and the RS485 connector on the Qbus QMI interface must be done using solid conductors with a maximum of 0.8 mm². Use a CAT5 cable for this purpose. The green EIB cable can also be used for this (use the conductors individually).

  TCP/IP

  Connect the network cable to the Modbus TCP port that makes a connection with the slave device via the network. 

• BUS connection

  It is recommended to use the Qbus cable or any other cable with a minimum of 2 conductors of 1mm² as the bus cable. The green shielded EIB cable can also be used if the conductors are paired to achieve a minimum cross-section of 2 x 1mm².

• LED indicator on the module

  PWR LED (green)

  • OFF: QMI module has no power via the bus
  • ON: QMI module has power via de bus 

  STATUS LED (red)

  • 3 flashes, once: QMI module is starting up
  • 1 flash + 3 flashes, once: when sending configuration from SMIII

  RX LED (green)

  • ON: The QMI module receives Modbus data

  TX LED (green)

  • ON: QMI module sends modbus data

Connection diagram

• Wiring diagram

  General Wiring Example

  Specific example of cabling with Daikin RTD modules